I am a complete noob who got a Vizio XVT553SV from a friend. It reportedly had sound, but no picture. I have disassembled it and see no obvious bulging caps. I have checked continuity on all the little fuses and, assuming I did it right, they're all fine.
Where do I start in diagnosing?

Just plugged it in myself, LED backlighting seems to be working (the screen has a light to it, just no picture). I played a movie while shining a flashlight at the screen and looking up close, see nothing. Could the backlighting be overpowering any faint image?